First timer for dublin marathon

Hey all, i am a 33 yr old. Mum of two. I have recently decided to run dublin marathon in october for a few reasons. I am naturally quite fit, i started training two weeks ago and am running about 3.5 miles in 37 mins 3 / 4 times a week. I want to know what training i should be doing before i start 16 week programme. All info appreciated!

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